_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Single-Phase Power-Measurement

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata.

19-5031; Rev 0; 11/09

Ordering Information

General Description

The MAXQ314 is a dedicated power-measurement IC

that collects and calculates voltage, current, power, and

power factor for a single-phase load. The results can

be retrieved by an external master through the internal

configure the operation of the MAXQ314 and monitor the

status of operations.

The MAXQ314 performs voltage and current measure-

ments using an integrated ADC that can measure voltage

and current. Other values such as power are calculated

from that data. The MAXQ314 also has an integrated

temperature sensor that provides the die temperature on

demand. The internal current amplifier produces up to

32x gain and the voltage amplifier gain is 1x.

Applications

Single-Phase AC Power Monitoring

Features

S

High-Performance, Low-Power DSP Core

S

On-Chip Digital Temperature Sensor

S

Precision Internal Voltage Reference

S

Active Power (W), < ±0.5% Error

S

Reactive Power (VAR), < ±0.7% Error

S

Apparent Power (VA), < ±0.7% Error

S

Power Factor, < ±1% Error

S

Voltage RMS, < ±0.2% Error

S

Current RMS, < ±0.5% Error

S

S

Continuous Output of IRMS in Serial or PWM

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

MAXQ is a registered trademark of Maxim Integrated Products, Inc.

Block Diagram

EVALUATION

KIT

AVAILABLE

PART

OPERATING VOLTAGE (V)

TEMP RANGE

PIN-PACKAGE

MAXQ314+

3.0 to 3.6

-40NC to +85NC

20 TQFN-EP*

MAXQ314

SCL

SDA

A0

A1

A2

AUX

RST

AVDD

AGND

DVDD

DGND

MUX

PGA

ADC

DSP

WATCHDOG

TIMER

INTERNAL

REFERENCE

INTERFACE

SERIAL/PWM

16-BIT

MAXQ20

RISC CPU

INTERNAL

8MHz CLOCK

GENERATOR

POWER-ON

RESET

(AVDD, DVDD)

BUS

VP

VN

IL

TEMP SENSOR